CAD

qcad

To get a 2D CAD emerge qcad from http://www.qcad.org/en (you get the Community Edition) and do not forget the parts catalog emerge qcad-parts to get the stuff in /usr/share/qcad-parts. It uses the standard dxf file format for the drawings. Qcad has a nice help.

Freemat

Freemat from http://freemat.sourceforge.net/ is an other matlab alternative. It can be started as FreeMat and runs matlab code directly, smooth and well, it has some incompatibilities when it comes to plotting graphics.


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